Concatenate Movies Compositor
Frames will give you control on the source’s duration (in frames): How many frames do you want to use? Playback will repeat the last frame unless you choose Cyclic* (see below)



Start Frame is the frame in the scene at which the video clip will start playing.

Offset allows you to select the first frame of the video source.

Cyclic* will make the cycle of frames start over. If you want to hold a frame, before or after the specified number of frames or freeze a frame you would need to disable this box.